TiO2颗粒表面包覆SiO2纳米膜及其表征  

SiO_2 NANOLAYERS AND CHARACTERISTICS COATED ON THE SURFACE OF TiO_2 PARTICLES

作　　者：何文森[1] 朱嘉林[2] 罗浩文[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054 [2]电子科技大学应用数学学院,四川成都610054

出　　处：《西南石油大学学报（自然科学版）》2008年第3期113-115,共3页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：TiO2作为一种重要的催化剂，在石油化工方面有重要的应用，特别是煤基合成油和超深度脱硫中的优越性受到注目。同时TiO2还是重要的白色颜料，为了提高TiO2的应用性能，对Ti02颗粒进行了SiO2纳米膜的表面包覆改性。采用精确控制pH值的连续法在TiO2颗粒表面包覆了SiO2的纳米层，并进行了TEM、HRTEM、EDS、XPS、ICP和光学性质表征。证明了SiO2在TiO2颗粒表面形成了一层连续的纳米膜，厚度大约为3．5-4．0nm，SiO2凝胶纳米膜比较致密，没有未包膜上的絮状物，而且TiO2是单颗粒分散，没有发生多个颗粒被包膜在一起的现象。XPS证明SiO2凝胶在包膜后的TiO2颗粒的表面为物理包覆。用SiO2包膜后，样品的光学性质有了明显的提高，同时改变了样品在不同介质中的分散性质，在水性介质中分散性能提高到93．0％。这种表面处理后的TiO2可以作为一种催化剂用于煤基合成油和超深度脱硫中。As an important catalyst,TiO2 is widely applied in petrochemical industry,especially,in coal-based synthesized oil and super-deep de-sulphure,meanwhile,TiO2 is also important raw material of white pigment.In order to improve the application function of TiO2,surface-coating modification of SiO2 nanolayers is done to TiO2 particles.The continuous method precisely controlling PH value is used to coat SiO2 nanolayers on the surface of TiO2 particles,and TEM,HRTEM,EDS,XPS,ICP and optical property are characterized.It is proved that a continuous SiO2 nanolayer forms on the surface of TiO2 particle with thickness of some 3.5~4.0 nm,the SiO2 gel nanolayer is quite tight without floccus on non-coated film,and the TiO2 is dispersed in the shape of single particle,there is no the occurance particles being coated together.XPS indicates SiO2 gel on the surface of TiO2 particle after coating is physically coated.After coating,the optical property of SiO2 sample is apparently improved,and the dispersing property of the sample in different media is changed,in water,the dispersing ability increases to 93.6%.The surface treatment,as a catalyst,can be used in coal-based synthesized oil and super-deep de sulphure

关 键 词：SIO2 SIO2 凝胶 纳米膜 

分 类 号：TE65[石油与天然气工程—油气加工工程]